Car truck



. y 6 1947. R. B. COTTRELL 2, 20,229

CAR TRUCK Filed July}, 1944 2 Sheets-Sheet 2 Patented May 6, 1947 UNITED CAR TRUCK Robert B. Cottrell,

Chicago, 111.,

assignor to American Steel Foundries, Chicago, 111., a corporation of New Jersey Application July 3, 1944, Serial No. 543,224

33 Claims.

My invention relates to a railway car truck and particularly to a car truck of the quick wheel change type.

The general object of my invention is to devise a novel form of connection between the side frame and the bolster in a railway truck which will facilitate the assembly or detachment of the bolster from the side frame and which may have ride control means in conjunction therewith utilizing friction devices to dampen the action of the bolster-supporting springs and to serve as additional means for squaring the car truck members.

A different object of my invention is to provide a novel form of interlocking arrangement between the side frame and bolster in a quick wheel change truck comprising a side frame having a post centrally disposed between the spaced columns defining the bolster opening, and a bolster having a bifurcated end portion with the respective legs thereof received between the post and columns, each of said bolster ends having integral arms extending on opposite sides thereof into pockets formed by the walls of the columns of each side frame and serving to interlock the bolster and side frame, and which arms may have engagement with friction absorbing devices serving to dampen the spring oscillations and as squaring instrumentalities in the truck.

My invention comprehends a novel form of side frame having a post intermediate the spaced col umns thereof merging with the columns into the compression and tension members of the side frame and receiving an associated member of the'truck, said post comprising inboard and outboard legs serving as positioning means for the bolster-supporting springs and also as a strengthening member for the side frame.

My invention further comprehends a bolster of novel form having a bifurcated end portion forming a jaw adapted to receive therewithin an associated member of the side frame, said end portion having arms on opposite sides thereof serving as interlocking means for interlocking the bolster with the side frame, and which arms may have engagement with friction elements in such manner as to permit the insertion or removal of the same as a unit with respect to the'side frames in the assembly or dismantling of the bolster and the side frames.

In the drawings,

Figure 1 is a fragmentary side elevation of a railway car truck incorporating my invention with a portion of the side frame column broken away, only one end portion being shown inas- 2 much as the'structureis similar at'opposite ends of the truck.

Figure 2 is a fragmentary sectional view through the truck structure shown in Figure l, the section being taken substantially in the transverse plane bisecting the truck as indicated by the line 22 of Figure 1.

Figure 3 is a top plan view of the truck structure shown in Figures 1 and 2, partly in section, the section being taken substantially in the horizontal plane indicated by the line 3-3 of Figure 1.

Figures 4 and 5 are fragmentary views of one of the interlocking arms on opposite sides of the bolster, Figure 4 being a top plan view thereof, and Figure 5 being a side view thereof.

Figures 6 and 7 show the form of friction shoe, Figure 6 being a side elevation thereof, and Figure '7 being a plan View thereof taken from the right as seen in Figure 6-.

Describing my invention in detail, my novel car truck may comprise a side frame having a compression member 2, a tension member 4, and theintegral columns 6, merging therewith to form th bolster opening 8 and also an integral column or post It centrally disposed in said bolster opening and merging with said compression member 2 and tension member 4, the side frame structure comprising also the usual integral brake hanger bracket H merging with the inboard wall of the column 6 adjacent its juncture with the compression member 2. Over the bolster opening the compression member may be of box section, as best seen at 12 in the sectional view of Figure 2, andbelow said bolster opening the tension member may also .be of box section comprising the inboard wall M, the outboard wall IS, the bottom chord is, the longitudinal vertical central Web '28, and the top chord 22. The top chord- 22 is widened and formed with upstanding inboard and outboard flanges 24 and 26 defining the spring seat '28 on which may be positioned a plurality of coil springs diagrammatically indicated at (it, 32 and 34 for supporting the bolster 36.

Referring now to Figures 1 and 2, the post It extends downwardly from the compression member 2 between the columns 6 and merges'with the inboard and outboard fianges 2B and 2'3. The post 40 is formed with an inboard leg $8 and an outboard leg 49, each of said legs being of U-section and comprising side walls 42, 42 connected by a wall 44. The legs 38 and 40 are joined at their upper ends by a transverse rib 46 depending from the compression member '2 and integrally connecting the vertical medialportions of the walls id of the legs above the spring 32. As best seen in Figure 2, the walls of the legs 38 and 38 flare outwardly as they approach the tension member 4 and merge with the inboard and outboard flanges 24 and 26 respectively as indicated at 48. It may be noted that the walls of the legs 38 and GB of the post if! cooperate with the flanges 24 and 26 to serve as positioning and retaining means therewith for the coil springs superposed on the seat 28, the walls 44 of the respective legs positioning the spring 32 th'erebetween, and the walls 42 of the legs assisting the respective inboard and outboard flanges in maintaining the springs 33' and 34 in predetermined positions on the spring seat 23.

On the springs may be supported the end of the bolster 36 which projects into the bolster opening 8 and is seated on the springs. The end of the bolster is bifurcated and comprises spaced legs 50 disposed on opposite sides of the post It in' spaced relation thereto and to the columns ('2. Each of the legs 50 is of box section and comprises a top wall 52, a bottom wall 1, an outer side wall 58 adjacent the associated column 6, and an inner side wall 58 adjacent the post H3, said side walls 53, 58 being joined by an end wall 59 forming the jaw of the bolster end which receives therewithin the column or post It. Each leg of the bolster has a depending lug 60 at the extremity thereof, said lugs cooperating with one or more lugs 6!, 6! depending from the Wall 59 of the bolster, for positioning the legs in the bolster opening. The bottom walls 54 of the respective legs 50 are seated on the springs 35] and 34 and the portions of the spring 32 extending outwardly of the side walls 42, 52 of the column legs 38 and 4!].

To interlock the bolster legs 59 with the side frame, each of the legs is formed with a transversely extending interlocking member or arm 62 received within a pocket 63 extending the length of each column 6, said pocket being defined by the column inboard and outboard walls 6t and 66, and the transverse wall 98 connecting the same adjacent the window opening l0. Each arm 62 is formed integral with the associated bolster leg 50 and extends downwardly and outwardly of the bottom wall 54 and side wall 58 of each leg, each of said arms being continued into the end portion 12 formed at the extremity thereof and which may serve as actuating means for the associated ride control device to be later described.

The inboard wall 64 of each column 5 may be provided with an opening Hi (Figures 1 and 2) to accommodate the entrance of the adjacent end portion 12 of the arm 62 into the pocket 63 formed by the walls of the column 6, said opening being spaced from said compression member a distance at least equal to the distance between the arms or interlocking members and the upper surfaces of the bolster legs to permit the ready application or removal of the bolster at the top of the bolster opening with coincident application or removal of the end portions 12 of the bolster with respect to the openings 54 in the columns.

In each pocket 63 of the columns 6 may be mounted the U-shaped friction member 16 (Figure 3) comprising outboard and inboard friction panels 18 and 8B integral with the transverse panel 82, each of said panels engaging an associated wall of the column 6 and extending upwardly therein to the opening 14 in the column. The friction member is retained in such position by welding the panel 82 to the wall 58 of the column as indicated at 83 in Figures 1 and 3, the faces 84 and 85 of the inboard and outboard panels being formed as fiat friction surfaces.

Referring now to Figures 4 to 7 inclusive, each arm 62 of the bolster legs comprises a vertical transverse web 86 continued into the end portion 12. The ride control device supported on the end portion 72 of each arm is similar to that described in my Patent No. 2,295,558, issued September 15, 1942. More particularly, said end portion 12 comprises a plurality of spaced lugs 88, 88 alternately arranged on opposite sides of the web 86 adapted to be interlaced with a series of similarly arranged lugs formed on one side of the rectangular shoes 92, 92, the other side of the shoes presenting the flat friction surfaces 93 in frictional engagement with the friction surfaces and 85 of the adjacent friction panels ?8 and 89. Each of the lugs 88 adjacent the bolster end is provided with a reinforcing rib 95 formed integral therewith and the web 86 and tapering away from the lug to merge as at 9% with the web 86. The lugs 88 and 96 serve to house the end portions of the compression springs diagrammatically indicated at 91, 9'1, the outer ends of which may seat against the inner faces 98 of the friction shoes 92, 92 and the inner or adjacent ends of said springs may seat against the adjacent faces of the web 88. Thus the actuator arm 62 is positioned in interlocking relationship with the columns -3 of the side frame, and more particularly, with both of the friction shoes 92, 92 so that as the bolster moves vertically up and down, such movement will be resisted by the frictional engagement of the shoes against the surfaces 8t and 35 of the friction member 18 which member serves as a housing for the friction device.

It may be noted that inasmuch as the arm 62 is formed integral with the bolster end and moves therewith laterally as well as vertically, the lateral play between the bolster end and the side columns 6 and post N3 of the side frame will be limited by the clearance afforded as at 100 and H32 (Figure 2) between the lugs 90 of each of the shoes 92, 92 and the adjacent inner face of the end portion 12 of the arm. At the same time, such relative lateral motion between the bolster and the side frame will be somewhat restrained by the compression springs 97, 9?, which springs are designed to create sumcient and substantially constant pressure against the shoes in order to develop a relative constant friction between the shoes and the friction panels 18 and 8!) which will effectively cushion and resist out-of-square movement of the bolster with respect to the side frame, such movement of the bolster causing further compression of the springs which react to restore the bolster to its proper relationship with the side frame.

It will also be apparent that any weakness of the side frame caused by the openings receiving the arms of the bolster in the columns 6 is compensated by the increased structural strength of the side frame afforded by the post H1 integrally connecting the compression and tension members.

In the assembly of the truck, the shoes 92, Q2 and springs 91, 91 are held in assembled relation with each end portion 12 of the bolster, the legs of the bolster then being inserted at the top of the bolster opening straddling the post is of the side frame simultaneous with the entrance of each friction assembly in the opening M in the associated. column 6 and into the pocket 63 of the column, consequent downward movement of the bolster legs for engagement with the bolstersupporting springs causing the friction surfaces of the shoes to engage the wear surfaces of the friction panels mounted in the columns. Disassembly of the truck may be effected by reverse movement of the bolster relative to the side frame. It may be noted that the bolster and its associated interlocking and friction elements can be readily assembled or detached from the side frame to, permit a quick wheel change.

It is to be understood that I do not wish to be limited by the exact embodiment of the-device shown which is merely by way of illustration and not limitation as various and other forms of the device will, of course, be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

I claim:

1. In a railway car truck, a side frame comprising tension and c pression members and paced columns defining a bolster opening, said ension member being, of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls, a post extending between said compression member and said tension member in said bolster opening, said post comprising spaced inboard and outboard legs herding at opposite ends thereof into said compression mem er and respective flanges and forming with said flanges spring positionin means, a plurality of springs supported on said seat between said legs and said flanges, a bolster seated on said springs, said bolster having a bifurcated extremity with the spaced legs thereof receive" said posttherebetween, an interlocking member associated with each bolster leg, each of said members having an end portion extending between the walls of adjacent column, friction panels mounted on the inboard and outboard walls of said columns, friction shoes supported on end portions in engagement with said panels, and resilient members under compression between each end portion and the associated friction shoes, each of said columns having an opening the inboard wall thereof spaced from said compression. member a distance at least equal; to the distance between the upper surface of each bolster leg and the associated interlocking member, and said column opening being of greater depth than. that of either of the associated friction. shoes or the associated interlocking members, to permit application or removal of said end portions and their associated friction shoes from said columns coincident with the application or removal of said bolster legs at the top. of said bolster opening.

2, In a railway car truck, a side frame comprising tension andcompression members and spaced co umns, definin a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of columns comprising spaced inboard outboard walls, a post extending between said compression member and said tension member in said bolster opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and respective flanges, a plurality of springs supported on. said seat, a bolster seated on said springs, said bolster having a bifurcated extremity with the spaced legs thereof receiving said post therebetween, an interlocking member associated with each bolster leg, each of said members having an end portion extending between the walls of an adjacent column, friction panels mounted on the inboard outboard walls, of said columns, friction shoes supported on said end portions in engagement with said panels, and resilient members under compression between each end portion and the associated friction shoes, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the upper surface of each bolster leg and the associated interlocking member, and said column opening being of greater depth than that of either of the associated friction shoes or the associated interlocking members, to perit application or removal of said end portions a .d their associated friction shoes from said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

3. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension memberbeing of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls, a post extending between said compression member and said tension mem ber in said bolster opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and respective flanges an forming with said flanges spring positioning means, a plurality of springs supported on said seat between said legs and said flanges, a bolster seated on said springs, the end of said bolster being bifurcated with the legs thereof positioning said post therebetween, an interlocking member extending outwardly at each side of said bolster end into an adjacent column, friction shoes supported on said members between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient mem.

bers under compression between each member and the associated shoes, each of said columns having an opening in the inboard Wall thereof spaced from said compression member a distance at least equal to the distance between the spaced columns defining a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring 7 seat, each of said columns comprising spaced inboard and outboard walls, a post extending between said compression member and said tension member said bolster opening; said post com.- prising spaced inboard and outboard: legs merging atopposite endsv thereof into said1compressioii member and respective flanges and forming with said flanges spring positioning means, a plurality of springs supported on said seat between said legs and said flanges, a bolster seated on said springs, said bolster having a bifurcated extremity with the legs thereof receiving said post therebetween, an interlocking member extending downwardly and outwardly of each bolster leg into an adjacent column, friction shoes supported on said members between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient members under compression between each interlocking member and the associated shoes, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the depth of said bolster legs to permit application or removal of said interlocking members and their associated friction shoes from said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

5. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened to form a spring seat, each of said columns comprising spaced inboard and outboard walls, a post extending between said compression member and said tension member in said bolster opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression memher and respective flanges, a plurality of sprin s supported on said seat, a bolster seated on said springs, the end of said bolster being bifurcated with the legs thereof positioning said post therebetween, an interlocking member extending outwardly at each side of said bolster end into an adjacent column, friction shoes supported on said members between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient members under compression between each member and the associated shoes, each of said columns having .an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the upper surface of each bolster leg and the associated interlocking member to permit application or removal of said interlocking members and their associated friction shoes from said columns coincident with the application or removal of said bolster end at the top of said bolster opening.

6. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls, a post extending between said compression member and said tension member in said bolster opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and respective flanges, a plurality of springs supported on said seat, a bolster seated on said springs, said bolster having a bifurcated extremity with the legs thereof receiving said post, an interlocking member extending downwardly and outwardly of each bolster leg into an adjacent column, friction shoes supported on said members between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient members under compression between each interlocking member and the associated shoes, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the depth of said bolster legs to permit application or removal of said interlocking members and their associated friction shoes from said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

7. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said opening with the top chord of said box section widened to form a spring seat, each of said columns comprising spaced inboard and outboard walls connected by a transverse wall defining therewith a pocket, a post extending between said compression and tension members in said bolster opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and said tension member, a plurality of springs supported on said seat, a bolster seated on said springs, said bolster having a bifurcated extremity with the spaced legs thereof receiving said post therebetween, an interlocking member extending outwardly of each bolster leg into an adjacent column, friction panels mounted on opposite sides of said column walls, and friction means associated with said interlocking members engaging said friction panels, each of said columns having an openin in the inboard wall thereof spaced from said compression membe a distance at least equal to the distance between the upper surface of each bolster leg and the associated interlocking member to permit application or removal of said interlocking members and their associated friction means from said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

8. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box secton beneath said opening with the top chord of said box section widened to form a spring seat, each of said columns comprising spaced inboard and outboard walls connected by a transverse wall defining a pocket, a post disposed between said columns in said bolster opening and merging at opposite ends thereof into said compression member and said tension member, a plurality of springs supported on said seat, a bolster seated on said springs, said bolster havin a bifurcated extremity with the spaced legs thereof receiving said post therebetween, an interlocking member extending outwardly of each bolster leg into an adjacent pocket, friction surfaces on the walls of said pocket, and friction means associated with said interlocking members engaging said friction surfaces, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the upper surface of each bolster leg and the associated interlocking member to permit application or removal of said interlocking members and their associated friction means from, said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

9. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, each of said columns havin spaced inboard and outboard walls and a transverse wall defining a pocket, a post extending between said tension and compression members in said bolster opening and merging at opposite ends thereof into said members, a plurality of springs supported on said tension member in said bolster opening, a bolster projecting into said opening, said bolster having a bifurcated extremity with the spaced legs thereof receivini said post therebetwen, an interlockmember associated with each bolster leg and extend: g outwardly therefrom into an adjacent pocket, friction surfaces on the walls of said pockets, and friction means associated with said interlocking members engaging said friction surfaces, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the upper surface of each bolster leg and the associated interlocking member to permit application or removal of said interlocking members and their associated friction means from said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

10. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, each of said columns having spaced inboard and outboard walls, a post extending between said compression and tension members in said bolster opening and merging at opposite ends thereof into said members, a plurality of springs supported on said tension member in said bolster opening, a bolster end projecting into said opening,

d bolster end comprising spaced legs receivsaid post therebetween, friction surfaces on pposi'te sides of the inboard and outboard walls said columns, a member associated with each 1 said bolster legs and having arms extending laterally of said bolster legs into an adjacent column, and friction means associated with said arms engaging said friction surfaces, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the upper surface of each bolster leg and the associated interlocking member to permit application or removal of said interlocking members and their associated friction means from said columns coincident with the application or removal of said bolster legs at the top of said bolster opening.

11. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said opening with the top chord of said box section widened to form a spring seat, each of said columns comprising spaced inboard and outboard walls connected by a transverse wall defining therewith a pocket, a post extending between said compression and tension members in said bolster opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and said tension member, a plurality of springs supported on said seat, a bolster seated on said springs, said bolster having a bifurcated extremity with the spaced legs thereof receiving said post therebetween, an interlocking member extending outwardly and downwardly of each bolster leg between the adjacent springs and into an adjacent column, fric- 10 tion surfaces supported by opposite sides of said column walls, and friction means associated with said interlocking members engaging said friction surfaces,

12. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said opening with the top chord of said box section widened and formed with upstanding inboard outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls connected by a transverse wall defining a pocket, a post disposed between said columns in said bolster opening and comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and respective flanges of said tension member and forming with said flanges spring-positioning means, a plurality of springs supported on said seat between said legs and said flanges, a bolster seated on said springs, said bolster having a bifurcated extremity with the spaced legs thereof receiving said post therebetween, an interlocking member extending outwardly and downwardly of each bolster leg between the adjacent springs and into an adjacent pocket, friction surfaces on the walls of said pocket, and friction means associated with said interlocking members engaging said friction surfaces.

13. In a railway car truck, a side frame comprising tension and compression members and spaced columns integral therewith defining a bolster opening and spaced window openings, each of said columns having spaced inboard and outboard walls and a transverse wall defining a pocket, a post extending between said tension and compression members in said bolster opening and merging at opposite ends thereof into said members, a plurality of springs supported on said tension member in said bolster opening, a bolster projecting into said bolster opening, said bolster having a bifurcated extremity with the spaced legs thereof extending transversely of said frame and receiving said post therebetween, an interlocking member associated with each bolster leg and extending laterally therefrom in spaced relation to said springs and into an adjacent pocket, friction surfaces on the walls of said pockets, and friction means supported by said interlocking members engaging said friction surfaces.

14. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening and spaced window openings, each of said columns having spaced inboard and outboard walls, a post extending between said compression and tension members in said bolster opening and merging at opposite ends thereof into said members, a plurality of springs supported on said tension member in said bolster opening, a bolster end projecting into said bolster opening, said bolster end comprising spaced legs supported from said springs and receiving said post therebetween, friction surfaces on opposite sides of the inboard and outboard walls of said columns, arms integral with and extending laterally of said bolster legs in spaced relation to said springs and into respective columns, and friction means associated with said arms engaging said friction surfaces.

15. In a railway car truck, a side frame having tension and compression members and spaced columns defining a bolster opening and spaced window openings, said columns having spaced 11 inboard and outboard walls, a friction panel on each of said column walls, a post extending between said tension and compression members in said bolster opening and merging therewith, a bolster end extending into said bolster opening, said bolster end being bifurcated with the spaced legs thereof disposed on opposite sides of said post and supported from said springs, an interlocking member integral with each bolster leg in spaced relation to said springs and extending between the walls of an adjacent column, friction shoes mounted on said interlocking members in engagement with respective friction surfaces of said column walls, and resilient means supported from said interlocking members and urging said shoes against said friction surfaces.

16. In a railway car truck, a side frame comprising tension and compression members and spaced columns integral therewith defining a bolster opening, each of said columns having spaced inboard and outboard walls, spring means on said tension member in said opening, a post extending between said tension and compression members in said bolster opening and merging therewith, a bolster supported on said spring means, said bolster having a bifurcated end portion receiving said post therewithin, interlocking members associated with said bolster end and comprising arms extending downwardly between the adjacent springs and laterally between said column walls, friction surfaces on said column walls adjacent opposite sides of an associated arm, and friction means supported on said arms engaging said surfaces.

1'7. A side frame having tension and compression members and spaced columns forming therewith a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising inboard and outboard walls, a post extending between said tension and compression members, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and respective flanges and forming with said flanges spring positioning means, and opposed friction surfaces associated with said inboard and outboard walls of said columns.

18. In a railway car truck, a side frame having tension and compression members and spaced columns forming therewith a bolster opening, each of said columns comprising inboard and outboard walls, a post extending between said tension and compression members in said bolster opening and merging therewith, opposed friction surfaces on the walls of said columns, and an opening in the inboard wall of each column for receiving an associated bolster.

19. A bolster having bifurcated end portions, each of said end portions comprising spaced legs in longitudinal alignment with said bolster adapted to receive an associated member of a side frame and providing spaced spring seats for seating said bolster on associated spring means, and arms integral with said end portions and aligned transversely of said bolster between said seats and extending transversely and downwardly from each end portion for interlocking engagement with a side frame column, said arms being adapted to support friction means for engagement with friction surfaces on a side frame column.

20. In a railway car truck, a bolster having bifurcated end portions longitudinally aligned therewith for receiving an associated member of respective side frames, said portions providing seats for seating said bolster on associated spring means, each end portion comprising spaced top 5 and bottom horizontal walls, and a member integrally formed on one of said walls of each end portion and extending transversely of said end portions, said membersprojecting beyond the opposite sides of said bolster and adaptable for interlocking engagement with the columns of the truck side frames.

21. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls, a plurality of springs supported on said seat, a bolster seated on said springs, an interlocking element associated with each side of said bolster of said elements extending downwardly between the adjacent springs and outwardly between the walls of an adjacent column, friction panels mounted on the inboard and outboard walls of said columns, friction shoes supported on said elements in engagement with said panels, and resilient means under compression between each element and the associated friction shoes, each of said columns having an opening in the inboard wall thereof spaced from one of said members a distance at least equal to the distance between the adjacent surface of said bolster and the associated interlocking element, and said column opening being of greater depth than that of either of the asso ciated friction shoes or the associated interlocking elements, to permit application or removal of said elements and their associated friction shoes from said columns coincident with the application or removal of said bolster relative to said bolster opening.

22. In a railway car truck, a side frame com- 45 prising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstand- 50 ing inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls, a plurality of springs supported on said seat, a bolster seated on said springs, an interlocking element extending downwardly and outwardly at each side of said bolster between the adjacent springs and into an adjacent column, friction shoes supported on said elements between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient means under compression between each interlocking element and the associated shoes, each of said columns having an opening in the inboard wall thereof spaced from one of said 5 members a distance at least equal to the depth of said bolster to permit application or removal of said interlocking elements and their associated friction shoes from said columns coincident with the application or removal of said 70 bolster relative to said bolster opening.

23. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said 75 bolster opening with the top chord of said box l3 section widened to form a Spring seat, each of said columns comprising spaced inboard and outboard walls, a plurality of springs supported on said seat, a bolster seated on said springs, an interlocking element extending outwardly and downwardly at each side of said bolster end be tween the adjacent springs and into an adjacent column, friction shoes supported on said elements between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient means under compression between each element and the associated shoes, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the adjacent surface of said bolster and the associated interlocking element to permit application or removal of said interlocking elements and their associated friction shoes from said columns coincident with the application or removal of said bolster end relative to said bolster opening.

24. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath opening with the top chord of said box section widened to form a spring seat, each of said co1- umns comprising spaced inboard and outboard walls connected by a transverse wall defining :1":

therewith a pocket, a plurality of springs supported on said seat, a bolster seated on said springs, an interlocking member extending outwardly and downwardly each side of said bolster between the adjacent springs and into an adjacent column, friction panels mounted on opposite sides of said column walls, and friction means associated with said interlocking members engaging said friction panels, each of said columns having an opening in the inboard wall thereof spaced from said compression member a distance at least equal to the distance between the upper surface of said bolster and the associated interlocking member to permit applicaion or removal of said interlocking members and their associated friction means from said columns coincident with the application or removal of said bolster at the top of said bolster opening.

25. In a railway car truck, a side frame comprising. tension and compression members and spaced columns defining a bolster opening, each of said columns having spaced inboard and outboard walls and a transverse wall defining a pocket, a plurality of springs supported on said tension member in said bolster opening, a bolster projecting into said opening, an interlocking element associated with each side of said bolster and extending outwardly therefrom into an adjacent pocket, friction surfaces on the walls of said pockets, friction means supported solely by said interlocking elements and engaging said friction surfaces, each of said columns having an opening in the inboard wall thereof spaced from one of said members a. distance at least equal to the distance between the adjacent surface of said bolster and the associated interlocking element to permit application or removal of asid interlockin elements and their associated friction means from said columns coincident with the application or removal of said bolster relative to said bolster opening.

26. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, each of said columns having spaced inboard and out- 14 board walls, a plurality of springs supported on said tension member in said bolster opening, a bolster end projecting into said opening, friction surfaces on the inboard and outboard walls of said columns, an interlocking element associated with each side of said bolster extending later? ally into an adjacent column, and friction means supported solely by said interlocking elements and engaging said friction surfaces, each of said columns havin an opening in the inboard wall thereof spaced from the adjacent member a distance at least equal to the distance between said bolster and the associated interlocking element to permit application or removal of said interlocking elements and their associated friction means from said columns coincident with the application or removal of said bolster with respect to said bolster opening.

2'7. In a railway car truck, a side frame comprising spaced columns partly defining a bolster opening, each of said columns comprising inboard and outboard walls, springs supported on said frame between said columns, a bolster end supported on said springs in said opening and having members integral therewith extending between certain of said springs and between said walls, and friction means associated with said members in engagement with said walls, each of said columns having an opening to permit application and removal of the associated member coincidently with said bolster relative to said opening.

28. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls connected b a transverse wall defining a pocket, a plurality of springs supported on said seat, a bolster seated on said springs, an interlocking member integral with the bottom of said bolster extending between the adjacent springs and into an adjacent pocket, friction surfaces supported by the walls of said pocket, and friction shoes and resilient means associated with each member, said resilient means urging said shoes into engagement with said friction surfaces.

29. In a railway car truck, a side frame comprising spaced columns, each column having spaced inboard and outboard walls, a plurality of springs supported on said frame between said columns, a bolster supported from said springs and. having members integral with the bottom thereof and extending between certain of said springs and toward respective columns, and friction means associated with said members and having engagement with friction means supported by said walls.

30. A side frame having tension and compression members and spaced columns forming therea bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising inboard and outboard walls, a post extending between said tension and compression members, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and respective flanges, and friction surfaces associ- 15 ated with said inboard and outboard walls of said columns.

31. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said opening with the top chord of said box section widened to provide a spring seat, each of said columns comprising inboard and outboard walls, springs on said seat, a post extending between said members and merging at opposite ends thereof with said compression member and said top chord, spring-positioning means on said seat and the adjacent extremity of said post, a bolster supported on said springs, members integral with said bolster at opposite sides thereof, and friction means solely supported by said last-mentioned members and having engagement with the inboard and outboard walls of said columns.

32. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening, said tension member being of box section beneath said bolster opening with the top chord of said box section widened and formed with upstanding inboard and outboard flanges defining a spring seat, each of said columns comprising spaced inboard and outboard walls, a post extending between said compression member and said tension member in said opening, said post comprising spaced inboard and outboard legs merging at opposite ends thereof into said compression member and re spective flanges and forming with said flanges spring-positioning means, a plurality of springs supported on said seat between said legs and said flanges, a bolster seated on said springs, said bolster having a bifurcated extremity with the legs thereof receiving said post therebetween, an interlocking member extending downwardly and outwardly of each bolster leg into an adjacent column, friction shoes supported on said members between the walls of said columns, friction surfaces on the walls of said columns in engagement with said shoes, and resilient members under compression between each interlocking member and the associated shoes.

33. In a railway car truck, a side frame comprising tension and compression members and spaced columns defining a bolster opening and spaced window openings, said tension member being of box section beneath said opening with the top chord of said box section widened to provide a spring seat, springs on said seat, a sub stantially vertical post extending between said members and merging at opposite ends thereof with said compression member and said top chord, a bolster supported on said springs and having spaced members integral therewith and projecting laterally therefrom toward said columns, and friction means supported by said arms in a horizontal plane extending beneath said bolster and having frictional engagement with friction means on said columns.

ROBERT E. COTTRELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,348,453 Couch May 9, 1944 2,053,989 Goodwin Sept. 8, 1936 2,277,263 Tucker Mar. 24, 1942 2,283,332 Light May 19, 1942 2,295,558 Cottrell Sept. 15, 1942 1,536,137 Priebe May 5, 1925 2,032,996 Leppla Mar. 3, 1936 2,305,914 Tucker Dec. 22, 1942 778,739 Buhoup Dec. 27, 1904 2,295,553 Cottrell Sept. 15, 1942 2,333,920 Flesch Nov. 9, 1943 

